The Service Sector Prepares for HFO-1234yf Paul DeGuiseppi MACS Worldwide Mary Koban, DuPont Fluoroproducts

The Service Sector Prepares for HFO-1234yf Paul DeGuiseppi MACS Worldwide Mary Koban, DuPont Fluoroproducts

Agenda HFO-1234yf Review Service Differences Technician Training Recovery/Recycle/Recharge Equipment Storage and Handling

HFO-1234yf Properties Properties 1234yf 134a P vap, MPa (25 o C) 0.677 0.665 P vap, MPa (80 o C) 2.44 2.63 GWP (100 ITH) 4 1410 Toxicity A-Low A-Low Flammability Mild None 3.5 Vapor Pressure Pressure (MPa) 3 2.5 2 1.5 1 0.5 REFPROP Equation Of State available Temperature, o C 134a HFO-1234yf 0-40 -20 0 20 40 60 80 100 HFO-1234yf has vapor pressure, toxicity class A, similar to R-134a, but has mild flammability

Servicing Differences Some potential service differences for HFO-1234yf are: Service shops and technicians may need to purchase/use new equipment (flammability/product differences) Recovery/recycle/recharge equipment Refrigerant identifiers Leak detection equipment HFO-1234yf 1234yf refrigerant system components should not be replaced with ones removed from a system that uses another type of refrigerant, or from a salvaged vehicle Replacement evaporators should meet SAE J2842 HFO-1234yf 1234yf is mildly flammable Precautions used with other flammables (gasoline, oil) are applicable to HFO-1234yf

Servicing Differences Some potential service differences for HFO-1234yf are: Lubricants used with HFO-1234yf systems may be different than those currently used Hybrid compressors, driven by high-voltage electric motors, or equipped with hermetic mobile A/C systems, use different oils Necessary to check oil requirements Do-it it-yourselfers may charge non-approved refrigerants into HFO-1234yf systems Result refrigerant cross contamination Could cause system failure and/or system misdiagnoses

Servicing Differences Typical OEM R-134a Label Proposed OEM HFO-1234yf Label Additional Information: Refrigerant flammability symbol J2845 Technician Training for Safe Service and Containment of Refrigerants 6

Servicing Differences R-134a Valve Prop HFO-1234yf Valve NOT FINALIZED SAE J639 AC System Low Side Quick Connect

Servicing Best Practices In general, low lying areas, (such as workshop pits, shafts or cellar exits), may cause released refrigerant to pool as it is heavier than air Current regulations require work areas to be adequately ventilated and extraction units switched on if available. Refer to local, state and federal rules and regulations regarding ventilation. Care should be taken to avoid over-charging of the refrigerant system. Service technicians should not smoke or have any open flame present while working on refrigerant containing systems

Technician Training per SAE J2845 Technician Service Related (1) Understand unique differences between R-1234yf R and HFC-134a; (2) Identification of unique fittings/labels for each refrigerant t along with tank identification; (3) How to use refrigerant identification equipment; (4) How to use leak detection equipment and/or fluorescent dyes to identify leaks with each refrigerant; (5) System servicing practices (incl. proper recovery/recycling/recharge) recharge) Safety and Environmental Related (6) Follow vehicle manufacturer recommendations, to promote technician safety and minimize environmental impact using appropriate recovery, recycling and charging equipment; (7) Technicians must have a good understanding of the safety requirements defined in SAE J639. OEM s have requested this standard to provide similar basis for technician refrigerant training

Technician Training per SAE J2845 Intent of J2845 is to provide sufficient technician training, and d to highlight refrigerant handling differences

R/R/R Equipment-J2843 J2843 HFO-1234yf Recovery/Recycling/Recharging Equipment for Flammable Refrigerants for Mobile Air-Conditioning Systems Highlights Machines internal components reduce/minimize arcing/sparking Machines will have additional cabinet ventilation New hose connections will be required with HFO-1234yf (J639) HFO-1234yf refrigerant cylinder color white with red band per J639 New equipment will prevent re-charge if system has a leak. Machine has 2-step process 1. Vacuum Check Pull vacuum, check for decays If system decays, will stop machine 2. Pressure Check If vacuum does not decay, will add 10% charge Monitor pressure, check for pressure decay If the pressure decays, remaining 90% of the refrigerant will not be administered.

Recovery Equipment-J2851 J2851 HFO-1234yf Recovery Only Equipment for Flammable Refrigerants for Mobile Air-Conditioning Systems Highlights: Machines internal components reduce/minimize arcing/sparking Machines will have additional cabinet ventilation New hose connections will be required with HFO-1234yf (J639) HFO-1234yf Refrigerant cylinder color- white with red band per J639 New equipment will prevent re-charge if system has a leak. Machine will RECOVER, even if there is a system leak

Storage and Handling Information HFO-1234yf package options exist for both disposable and returnable containers Disposable packages limited to about 2 lb size Current DOT regulations prohibit packaging flammable gases in DOT 39 disposable containers beyond 0.75 in 3 interior volume. Returnable packages available in 2, 5, 10, 20 and 30 lb size Currently working with DOT to understand additional HFO-1234yf disposable packaging options. Check with your local, state or federal agencies, as storage of multiple containers of refrigerant may be subject to regulation. Refrigerant should always be stored in a cool, dry location, out of direct sunlight

Storage and Handling Information R-134a HFO-1234yf HFO-1234yf 30 lb disposable containers Light blue package color 30 lb returnable containers White with red band package color Packages have about the same footprint, ie. They take about the same floor space.

Summary To prepare for HFO-1234yf service technicians will need.. New recovery/recycle/recharge or recovery-only only equipment New refrigerant identifier New leak detection equipment Assure adequate ventilation and follow flammable storage practices per local, state and federal regulations Appropriate technician training

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